/*
 * Copyright 2022 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.accompanist.adaptive

import android.app.Activity
import androidx.compose.runtime.Composable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.produceState
import androidx.compose.runtime.remember
import androidx.window.layout.DisplayFeature
import androidx.window.layout.WindowInfoTracker

/**
 * Calculates the list of [DisplayFeature]s from the given [activity].
 */
@Composable
public fun calculateDisplayFeatures(activity: Activity): List<DisplayFeature> {
    val windowLayoutInfo = remember(activity) {
        WindowInfoTracker.getOrCreate(activity).windowLayoutInfo(activity)
    }
    val displayFeatures by produceState(
        initialValue = emptyList<DisplayFeature>(),
        key1 = windowLayoutInfo
    ) {
        windowLayoutInfo.collect { info ->
            value = info.displayFeatures
        }
    }

    return displayFeatures
}
